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/*
* Copyright (C) 2006 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.util.concurrent;
import junit.framework.TestCase;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
/**
* Unit test for {@link SimpleTimeLimiter}.
*
* @author kevinb
*/
public class SimpleTimeLimiterTest extends TestCase {
private static final int DELAY_MS = 50;
private static final int ENOUGH_MS = 500;
private static final int NOT_ENOUGH_MS = 5;
private TimeLimiter service;
private static final ExecutorService executor
= Executors.newFixedThreadPool(1);
private static String someGoodStaticMethod() throws InterruptedException {
TimeUnit.MILLISECONDS.sleep(DELAY_MS);
return "yes";
}
private static String someBadStaticMethod() throws InterruptedException,
SampleException {
TimeUnit.MILLISECONDS.sleep(DELAY_MS);
throw new SampleException();
}
@Override protected void setUp() throws Exception {
super.setUp();
service = new SimpleTimeLimiter(executor);
}
public void testGoodCallableWithEnoughTime() throws Exception {
long start = System.nanoTime();
String result = service.callWithTimeout(
new Callable<String>() {
@Override
public String call() throws InterruptedException {
return someGoodStaticMethod();
}
}, ENOUGH_MS, TimeUnit.MILLISECONDS, true);
assertEquals("yes", result);
assertTheCallTookBetween(start, DELAY_MS, ENOUGH_MS);
}
public void testGoodCallableWithNotEnoughTime() throws Exception {
long start = System.nanoTime();
try {
service.callWithTimeout(
new Callable<String>() {
@Override
public String call() throws InterruptedException {
return someGoodStaticMethod();
}
}, NOT_ENOUGH_MS, TimeUnit.MILLISECONDS, true);
fail("no exception thrown");
} catch (UncheckedTimeoutException expected) {
}
assertTheCallTookBetween(start, NOT_ENOUGH_MS, DELAY_MS);
}
public void testBadCallableWithEnoughTime() throws Exception {
long start = System.nanoTime();
try {
service.callWithTimeout(
new Callable<String>() {
@Override
public String call() throws SampleException, InterruptedException {
return someBadStaticMethod();
}
}, ENOUGH_MS, TimeUnit.MILLISECONDS, true);
fail("no exception thrown");
} catch (SampleException expected) {
}
assertTheCallTookBetween(start, DELAY_MS, ENOUGH_MS);
}
public void testBadCallableWithNotEnoughTime() throws Exception {
long start = System.nanoTime();
try {
service.callWithTimeout(
new Callable<String>() {
@Override
public String call() throws SampleException, InterruptedException {
return someBadStaticMethod();
}
}, NOT_ENOUGH_MS, TimeUnit.MILLISECONDS, true);
fail("no exception thrown");
} catch (UncheckedTimeoutException expected) {
}
assertTheCallTookBetween(start, NOT_ENOUGH_MS, DELAY_MS);
}
public void testGoodMethodWithEnoughTime() throws Exception {
SampleImpl target = new SampleImpl();
Sample proxy = service.newProxy(
target, Sample.class, ENOUGH_MS, TimeUnit.MILLISECONDS);
long start = System.nanoTime();
assertEquals("x", proxy.sleepThenReturnInput("x"));
assertTheCallTookBetween(start, DELAY_MS, ENOUGH_MS);
assertTrue(target.finished);
}
public void testGoodMethodWithNotEnoughTime() throws Exception {
SampleImpl target = new SampleImpl();
Sample proxy = service.newProxy(
target, Sample.class, NOT_ENOUGH_MS, TimeUnit.MILLISECONDS);
long start = System.nanoTime();
try {
proxy.sleepThenReturnInput("x");
fail("no exception thrown");
} catch (UncheckedTimeoutException expected) {
}
assertTheCallTookBetween(start, NOT_ENOUGH_MS, DELAY_MS);
// Is it still computing away anyway?
assertFalse(target.finished);
TimeUnit.MILLISECONDS.sleep(ENOUGH_MS);
assertFalse(target.finished);
}
public void testBadMethodWithEnoughTime() throws Exception {
SampleImpl target = new SampleImpl();
Sample proxy = service.newProxy(
target, Sample.class, ENOUGH_MS, TimeUnit.MILLISECONDS);
long start = System.nanoTime();
try {
proxy.sleepThenThrowException();
fail("no exception thrown");
} catch (SampleException expected) {
}
assertTheCallTookBetween(start, DELAY_MS, ENOUGH_MS);
}
public void testBadMethodWithNotEnoughTime() throws Exception {
SampleImpl target = new SampleImpl();
Sample proxy = service.newProxy(
target, Sample.class, NOT_ENOUGH_MS, TimeUnit.MILLISECONDS);
long start = System.nanoTime();
try {
proxy.sleepThenThrowException();
fail("no exception thrown");
} catch (UncheckedTimeoutException expected) {
}
assertTheCallTookBetween(start, NOT_ENOUGH_MS, DELAY_MS);
}
private static void assertTheCallTookBetween(
long startNanos, int atLeastMillis, int atMostMillis) {
long nanos = System.nanoTime() - startNanos;
assertTrue(nanos >= atLeastMillis * 1000000);
assertTrue(nanos <= atMostMillis * 1000000);
}
public interface Sample {
String sleepThenReturnInput(String input);
void sleepThenThrowException() throws SampleException;
}
@SuppressWarnings("serial")
public static class SampleException extends Exception {}
public static class SampleImpl implements Sample {
boolean finished;
@Override
public String sleepThenReturnInput(String input) {
try {
TimeUnit.MILLISECONDS.sleep(DELAY_MS);
finished = true;
return input;
} catch (InterruptedException e) {
return null;
}
}
@Override
public void sleepThenThrowException() throws SampleException {
try {
TimeUnit.MILLISECONDS.sleep(DELAY_MS);
} catch (InterruptedException e) {
}
throw new SampleException();
}
}
}
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